package com.ml.bio;

import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 思路
 * 1. 创建一个线程池
 * 2. 如果有客户端连接，就创建一个线程，与之通讯(单独写一个方法)
 *
 * @author xr-8
 * @date 2022-01-08
 * @time 16:37
 */
public class BIOServer {

    public static void main(String[] args) throws Exception {
        //线程池机制
        ExecutorService newCachedThreadPool = Executors.newCachedThreadPool();
        //创建ServerSocket
        ServerSocket serverSocket = new ServerSocket(6666);

        System.out.println("服务器启动了");
        while (true) {
            System.out.println("线程信息 id =" + Thread.currentThread().getId() + " 名字=" + Thread.currentThread().getName());
            //监听，等待客户端连接
            System.out.println("等待连接....");
            final Socket socket = serverSocket.accept(); //当没有客户端连接时，这里会阻塞
            System.out.println("连接到一个客户端");
            //就创建一个线程，与之通讯(单独写一个方法)
            newCachedThreadPool.execute(() -> {
                //可以和客户端通讯
                handler(socket);
            });
        }

    }

    //编写一个handler方法，和客户端通讯
    public static void handler(Socket socket) {
        try {
            System.out.println("线程信息 id =" + Thread.currentThread().getId() + " 名字=" + Thread.currentThread().getName());
            byte[] bytes = new byte[1024];
            //通过socket 获取输入流
            InputStream inputStream = socket.getInputStream();

            //循环的读取客户端发送的数据
            while (true) {
                System.out.println("线程信息 id =" + Thread.currentThread().getId() + " 名字=" + Thread.currentThread().getName());
                System.out.println("read....");
                int read = inputStream.read(bytes);// 当客户端没有消息传递时，这里会阻塞
                if (read != -1) {
                    System.out.println(new String(bytes, 0, read)); //输出客户端发送的数据
                } else {
                    break;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            System.out.println("关闭和client的连接");
            try {
                socket.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
